If a book, song, movie, or artwork is in the public domain, then it is not protected by intellectual property laws (copyright, trademark, or patent laws)—which means it’s free for you to use without permission.[1]

About the Public Domain Mark[2] — “No Known Copyright

  1. ^ http://fairuse.stanford.edu/Copyright_and_Fair_Use_Overview/chapter8/index.html
  2. ^ http://creativecommons.org/about/pdm